When the mechanic at your auto repair shop provides service and maintenance suggestions, a working knowledge of automotive jargon will help you make the right choice. Walking into the appointment informed could also save you the cost of unnecessary repairs.

To keep our customers (and their wallets) safe no matter where their vehicle is serviced, here are 5 essential car terms every driver should know.

1. Dipstick

The ASE-certified technician will pull out your dipstick to visually check the level and quality of the liquid as well as determine whether you need an oil change (or to replace another fluid).

2. Spark Plug

When your key turns in the ignition, the spark plug ignites the fuel-air mixture and powers the engine. However, a burnt-out spark plug will not properly ignite. Likewise, a spark plug covered in water could flood the engine.

3. [Battery] Corrosion

If water sits on the outside casing, your battery can quickly corrode. Leaking acid and rust built up under the hood also causes corrosion. A corroded battery will not function properly and could lead to a dead engine.

4. Brake Pad

Over time, your brake pads wear out. When our ASE-certified professionals check your brake system, they’ll inspect the brake pads’ thickness. This ensures they’re the proper width to effectively (and safely) stop your car.

5. Timing Belt

The timing belt is covered in bumps, operates the camshaft, is usually made of reinforced rubber, and is responsible for opening and closing valves at the proper time. The camshaft is an essential moving component to any combustion engine.